Copy file automatically with write18

Question

With the following mini-template, I want to copy the distnate pdf file into another one automatically as I run pdflatex with --shell-escape:

\documentclass{article}
\begin{document}
  Just a test.

\write18{cmd /c copy\jobname.pdf \jobname-print.pdf}
\end{document}

The problem is that this can't work, since the file jobname.pdf is using by the engine. I will get a copy of empty file of size 0.

Also, please consider we are working in writing a cls file, it also expected to work as

\AtEndDocument{
\write18{cmd /c copy \jobname.pdf \jobname-print.pdf}
}